/* Copyright (C) 2003-2015 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <aio.h>
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>


static pthread_barrier_t b;


/* Cleanup handling test.  */
static int cl_called;

static void
cl (void *arg)
{
  ++cl_called;
}


static void *
tf (void *arg)
{
  int r = pthread_barrier_wait (&b);
  if (r != 0 && r != PTHREAD_BARRIER_SERIAL_THREAD)
    {
      puts ("tf: barrier_wait failed");
      exit (1);
    }

  pthread_cleanup_push (cl, NULL);

  const struct aiocb *l[1] = { arg };

  TEMP_FAILURE_RETRY (aio_suspend (l, 1, NULL));

  pthread_cleanup_pop (0);

  puts ("tf: aio_suspend returned");

  exit (1);
}


static void *
tf2 (void *arg)
{
  int r = pthread_barrier_wait (&b);
  if (r != 0 && r != PTHREAD_BARRIER_SERIAL_THREAD)
    {
      puts ("tf2: barrier_wait failed");
      exit (1);
    }

  pthread_cleanup_push (cl, NULL);

  const struct aiocb *l[1] = { arg };
  struct timespec ts = { .tv_sec = 1000, .tv_nsec = 0 };

  TEMP_FAILURE_RETRY (aio_suspend (l, 1, &ts));

  pthread_cleanup_pop (0);

  puts ("tf2: aio_suspend returned");

  exit (1);
}


static int
do_test (void)
{
  int fds[2];
  if (pipe (fds) != 0)
    {
      puts ("pipe failed");
      return 1;
    }

  struct aiocb a, a2, *ap;
  char mem[1];
  memset (&a, '\0', sizeof (a));
  a.aio_fildes = fds[0];
  a.aio_buf = mem;
  a.aio_nbytes = sizeof (mem);
  if (aio_read (&a) != 0)
    {
      puts ("aio_read failed");
      return 1;
    }

  if (pthread_barrier_init (&b, NULL, 2) != 0)
    {
      puts ("barrier_init failed");
      return 1;
    }

  pthread_t th;
  if (pthread_create (&th, NULL, tf, &a) != 0)
    {
      puts ("1st create failed");
      return 1;
    }

  int r = pthread_barrier_wait (&b);
  if (r != 0 && r != PTHREAD_BARRIER_SERIAL_THREAD)
    {
      puts ("barrier_wait failed");
      exit (1);
    }

  struct timespec  ts = { .tv_sec = 0, .tv_nsec = 100000000 };
  while (nanosleep (&ts, &ts) != 0)
    continue;

  puts ("going to cancel tf in-time");
  if (pthread_cancel (th) != 0)
    {
      puts ("1st cancel failed");
      return 1;
    }

  void *status;
  if (pthread_join (th, &status) != 0)
    {
      puts ("1st join failed");
      return 1;
    }
  if (status != PTHREAD_CANCELED)
    {
      puts ("1st thread not canceled");
      return 1;
    }

  if (cl_called == 0)
    {
      puts ("tf cleanup handler not called");
      return 1;
    }
  if (cl_called > 1)
    {
      puts ("tf cleanup handler called more than once");
      return 1;
    }

  cl_called = 0;

  if (pthread_create (&th, NULL, tf2, &a) != 0)
    {
      puts ("2nd create failed");
      return 1;
    }

  r = pthread_barrier_wait (&b);
  if (r != 0 && r != PTHREAD_BARRIER_SERIAL_THREAD)
    {
      puts ("2nd barrier_wait failed");
      exit (1);
    }

  ts.tv_sec = 0;
  ts.tv_nsec = 100000000;
  while (nanosleep (&ts, &ts) != 0)
    continue;

  puts ("going to cancel tf2 in-time");
  if (pthread_cancel (th) != 0)
    {
      puts ("2nd cancel failed");
      return 1;
    }

  if (pthread_join (th, &status) != 0)
    {
      puts ("2nd join failed");
      return 1;
    }
  if (status != PTHREAD_CANCELED)
    {
      puts ("2nd thread not canceled");
      return 1;
    }

  if (cl_called == 0)
    {
      puts ("tf2 cleanup handler not called");
      return 1;
    }
  if (cl_called > 1)
    {
      puts ("tf2 cleanup handler called more than once");
      return 1;
    }

  puts ("in-time cancellation succeeded");

  ap = &a;
  if (aio_cancel (fds[0], &a) != AIO_CANCELED)
    {
      puts ("aio_cancel failed");
      /* If aio_cancel failed, we cannot reuse aiocb a.  */
      ap = &a2;
    }


  cl_called = 0;

  size_t len2 = fpathconf (fds[1], _PC_PIPE_BUF);
  size_t page_size = sysconf (_SC_PAGESIZE);
  len2 = 20 * (len2 < page_size ? page_size : len2) + sizeof (mem) + 1;
  char *mem2 = malloc (len2);
  if (mem2 == NULL)
    {
      puts ("could not allocate memory for pipe write");
      return 1;
    }

  memset (ap, '\0', sizeof (*ap));
  ap->aio_fildes = fds[1];
  ap->aio_buf = mem2;
  ap->aio_nbytes = len2;
  if (aio_write (ap) != 0)
    {
      puts ("aio_write failed");
      return 1;
    }

  if (pthread_create (&th, NULL, tf, ap) != 0)
    {
      puts ("3rd create failed");
      return 1;
    }

  puts ("going to cancel tf early");
  if (pthread_cancel (th) != 0)
    {
      puts ("3rd cancel failed");
      return 1;
    }

  r = pthread_barrier_wait (&b);
  if (r != 0 && r != PTHREAD_BARRIER_SERIAL_THREAD)
    {
      puts ("3rd barrier_wait failed");
      exit (1);
    }

  if (pthread_join (th, &status) != 0)
    {
      puts ("3rd join failed");
      return 1;
    }
  if (status != PTHREAD_CANCELED)
    {
      puts ("3rd thread not canceled");
      return 1;
    }

  if (cl_called == 0)
    {
      puts ("tf cleanup handler not called");
      return 1;
    }
  if (cl_called > 1)
    {
      puts ("tf cleanup handler called more than once");
      return 1;
    }

  cl_called = 0;

  if (pthread_create (&th, NULL, tf2, ap) != 0)
    {
      puts ("4th create failed");
      return 1;
    }

  puts ("going to cancel tf2 early");
  if (pthread_cancel (th) != 0)
    {
      puts ("4th cancel failed");
      return 1;
    }

  r = pthread_barrier_wait (&b);
  if (r != 0 && r != PTHREAD_BARRIER_SERIAL_THREAD)
    {
      puts ("4th barrier_wait failed");
      exit (1);
    }

  if (pthread_join (th, &status) != 0)
    {
      puts ("4th join failed");
      return 1;
    }
  if (status != PTHREAD_CANCELED)
    {
      puts ("4th thread not canceled");
      return 1;
    }

  if (cl_called == 0)
    {
      puts ("tf2 cleanup handler not called");
      return 1;
    }
  if (cl_called > 1)
    {
      puts ("tf2 cleanup handler called more than once");
      return 1;
    }

  puts ("early cancellation succeeded");

  return 0;
}

#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
